[Onni]

Try a large bunny harness. It is exactly like the ferret harness but bigger. Onni is so tiny we had to buy her a ferret harness and since it fits like a jacket she is not going to get out of it. I bought mine at the feed store. When she outgrows her ferret harness I am buying her the larger Bunny harness. Here is a link to what one looks like - Rabbit Collars & Harnesses: Peter's Rabbit Walking Jacket at Drs. Foster & Smith